WASHINGTON - Donald Trump is ramping up pressure on Canada by threatening to use an obscure Great Depression-era legal tool to impose new tariffs — and it’s not clear whether there are any guardrails to rein in the president’s power.

Adam Radwanski: Donald Trump is betting on our weakness. We can’t afford to prove him right

The next month will be about proving him wrong. And so far, we’re not off to a half-bad start, writes Adam Radwanski.

Adam Radwanski: Donald Trump is betting on our weakness. We can’t afford to prove him right

The next month will be about proving him wrong. And so far, we’re not off to a half-bad start, writes Adam Radwanski.